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H. G. E. EGGERS & H. O. KIROHMANN.

Furnace for Steam-Boilers.

Patented Dec. 25, I877.

Mbzessw I CH b Ge y, 1

Improvement in Apparatus or Me ns uming Sinoke', of which the" follo escription, ref ra ying (11a s specification. Our inventi ch is applicable to fire- .5 places orfurnaces of various kinds, including those relating to, stoves, steam-boilers,jkilns, and; other he g structures 'orapparatus, subject 'onlyt chmodifications-o ,constructionasare essentialto its particular application, relates to twin fire-places orl-furnaces in communication with each other at their front, and alternately put in direct communication at their man with the chimney or outlet, in der that as each. fire -place' or j furnace is g gases therefrom,ini their escape to the chimney, Willbemade to pass over the incandescent. fuelin the adjacent fire place or fur- Y n e' u Pr c g P ect combu n of ch is andmprovement upon this description of twin furnaces, consists in a novel construction of the. duct used 1 {to establish communication between the two i fire-places or furnacesat their fronts, said duct being composed of anarched channel, arranged V iZOXOXtGIld' throughout thewidth, or therei about, of both'firajplaces, and the upper-portionof which is formed by an arched or raised ension of. thegrate-bars of ereby the Iuncons'umed S e sing fromfthe grate-secon which rece ves the fresh charge iof fuel not only haveafree escape to the ';adjacent grate-section, butz 'are more uniformly distributed to andover the incandescent fuel in ection, throughout its ent of airis or "may be r to mingle ina divided nniiynicn krnon GEBMAnni harged with efreslilfuel the smokeandresult- MANN, or HAMBURG,

'Specificati 13" retain" n of LetteIsPatent No. 193,587, dated December 25, 1877; application filed U I I September'14,1877.

or widely-distributed manner with the unconsumed gases to assist in their combustion.

-Figure 1 represents a front view of a furnace having our invention applied; Fig. 2, an irregular vertical section of the same on the line a: a2; and Fig. '3, an irregular horizontal section thereof on the line y y.

A A are the outer walls of the furnace, the grate of which is divided into duplicate parallel sections B B by a vertical partition-wall, S, which wall may be extended throughout the whole depth or height and length of the furnace, including its ash pit or pits. Each grate-section B B is provided with a sepa rate fire-door, b or b, and each ash-pit section 0 or C may also be similarly provided with a separate door, 0 c.

The grate-sections B B are connected in their rear by separate draft channels or ducts d d with a common outlet or chimney, D.

These ducts are controlled by a single valve,

E, having duplicate flaps or leaves 0 0, arranged at right angles with each other or otherwise, so as to control both ducts d d in such manner that when one of said ducts is open the other duct is closed. The fire-bars of each grate-section B or B are bent upward at their front ends, and said grate-sections are connected above theirbeds or bottoms through such bent-up portions of the bars by a front channel or duct, G.

In the operation of the furnace, after the coal has been properly lit in both sections B B, and fresh coal is supplied to either one of said sections, while the other of said sections presents a clearfire of live coal or coke, then the valve E is turned to close the outlet d or d from the grate-section which has had the green coal last supplied to it. This causes the smoke and unconsumed gases from said last-named section to pass along the front channel or duct G to the other grate-section, containing the live coal or coke, and in free communication by the valve E with the main outlet or chimney. This causes a perfect combustion of the escaping smoke or unconsumed gases by their passage over the live coal or coke, atmospheric air being freely supplied to ternately for either grate-section B or B, as fresh or green coal is supplied first to one section and then to the other by reversing the position of the valve E to divert the draft from the grate section containing the fresh coal through the front duct G to the grate-section havingtheclearfire,wherethe smoke andescaping gases from the section containing the green coal are consumed in their way or passage to the chimney. Each rear outlet from either fire-place, however, may, if desired, be con-I trolled by a separate valve.

What we claim as our invention, and desire to secure by Letters Patent, is-

In a twin furnace, in which the duplicate fire-places are in communication with each other at their front, and controlled by valves in their rear, toput either fireaplace alternately in direct communication with the chimney, the combination, with the twin fire-places or grate-sections B B, of the front duct G, arranged to extend throughout the width, or thereabout, of both fire-places, and the upper portion of which is formed of an arched or raised continuation or extension of the gratebars of said fire-places, substantially as and for the purposes-spifiedn H. .G. E. EGGERS. H.KIRGHMANN. Witnesses:

J. ENGEL, H. DAUL. 

